Wireless Weather Sensors
From Makers Local 256
Revision as of 19:24, 11 September 2011 by Brimstone
Designed to be simple to build, low parts cost, and low maintenance.
- Wirelessly transmit temperature and relative humidity to a main unit.
- Run off a single AA, two AA, or a 9v battery
- Two pins who's grounded status could be reported (think a door sensor, or something)
- Two pins that could be set to send 3.3v or 5v to run an relay
- Thermostat control?
- Identify all components
- Need opticron's help
- Determine if any of the SHTx line would be better and cheaper than the DHT22
- Figure out any additional components, pressure?
- Identify an AVR
- Validate with someone else
- Determine total pin count needed for AVR
- Identify cheapest AVR
- Order components and AVR
- Breadboard a prototype
- Design PCB
- Need crashcart's or mog's help
- Order or print prototype PCBs
- Need mog's help
- Build first test prototype
- Each unit will power up and listen for the sync signal from the master unit.
- Once they get the sync signal, they listen for any other already established units to send their data.
- Then they locate the next spot in the time slots.
- Something about collisions
- Something about the master allocating timeslots dynamically
- Something about filling in blank timeslots.
- A slave has all of the parts below
- A master has all of the same parts
- A master also piggybacks on an openmesh router or 802.11 device of some sort.
|Name||Price for 10 units||AVR pins required||Link||Alt Link|
|RFM22B-S2 Wireless Transceiver||$4.40||4(SPI)||http://www.hoperf.com/rf_fsk/RFM22B.htm|
|DHT22 Humidity and Temperature Sensor||$8.96||1 (i think)||http://www.sparkfun.com/products/10167|
|BMP085 - Pressure Sensor||?||?||?|
|Model||I/O Pins||Price per 10||Link|